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Magnetic Anomaly Images of the Australian Region

Abstract

These images are derived from the January 2002 edition of the "Magnetic Anomaly Grid of the Australian Region" (GEOCAT Record
: 38820). That grid is the first integrated onshore/offshore magnetic anomaly grid for the complete Australian margin extending
across 8S - 52S, 106E - 172E. The grid cell size is 0.01 degree (approx. 1 km). Earlier releases were restricted to portions
of NW and SW Australia.

Author(s)

Date (publication)

Product Type

Topic Category

Keywords

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound

-8.0

East bound

172.0

West bound

102.0

South bound

-52.0

Lineage

Using an ER Mapper algorithm associated with the "Magnetic Anomaly Grid of the Australian Region" (GEOMET Record : 4321) a
colour geo-referenced TIF with a cell size of 0.01 degrees was generated using the elevation palette and manipulated so as
to appear to be illuminated from the north-east. A compression ratio of 27 was used, utilising ER Mapper's ECW compression
algorithm, to compress the TIF image to an adequate size for provision over the Internet. The geo-referenced TIF was then
reprojected to Lambert Conformal Conic projection, with a cell size of approximately 1000 metres using ArcInfo. Georeferenced
TIF images and ECW compressed images were then generated for this projection in the same process outlined above.